Can a monk make a Stunning Strike on an Opportunity Attack?

The Monk Stunning Strike class feature states

When you hit with a melee weapon attack, you can spend 1 ki point to make the target stunned until the end of your next turn if it fails a CON saving throw.

Opportunity attacks allows you to

use your reaction to make one melee attack against the provoking creature.

Does an opportunity attack made with a melee weapon allow a monk to make their opportunity attack a stunning strike?

Can a battlemaster use Maneuvering Attack to prevent two creatures from opportunity attacking one ally?

Maneuvering Attack. When you hit a creature with a weapon attack, you can expend one superiority die to maneuver one of your comrades into a more advantageous position. You add the superiority die to the attack’s damage roll, and you choose a friendly creature who can see or hear you. That creature can use its reaction to move up to half its speed without provoking opportunity attacks from the target of your attack.

If an ally is within two enemies’ reaches, and the battlemaster has extra attack, hits and uses the maneuver on both enemies, and if the ally only uses the movement reaction when the second creature is hit, would that ally still take opportunity attacks from the first one?

Does an Echo provoke an opportunity attack when it moves?

The echo knight feature Manifest Echo says (emphasis mine):

At 3rd level, you can use a bonus action to magically manifest an echo of yourself in an unoccupied space you can see within 15 feet of you. This echo is a magical, translucent, gray image of you that lasts until it is destroyed, until you dismiss it as a bonus action, until you manifest another echo, or until you’re incapacitated.

Your echo has AC 14 + your proficiency bonus, 1 hit point, and immunity to all conditions. If it has to make a saving throw, it uses your saving throw bonus for the roll. It is the same size as you, and it occupies its space. On your turn, you can mentally command the echo to move up to 30 feet in any direction (no action required). If your echo is ever more than 30 feet from you at the end of your turn, it is destroyed.

Attack of Opportunity mentions (emphasis mine):

You can make an opportunity attack when a hostile creature that you can see moves out of your reach. To make the opportunity attack, you use your reaction to make one melee attack against the provoking creature. The attack occurs right before the creature leaves your reach.

The description does not state that the echo is a creature, so am I correct to conclude that the echo wouldn’t trigger an attack of opportunity?

Do Animated Objects make Opportunity Attacks?

Do the objects animated by the Animate Objects spell make opportunity attacks?

While I believe animated objects are certainly capable of opportunity attacks, the wording “If you command an object to attack, it can make a single melee attack against a creature within 5 feet of it” makes me wonder whether additional opportunity attacks are also implicit with this command.

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Can a druid get out of wild shape to avoid an opportunity attack?

Suppose a druid is shapeshifted into a beast of large size and adjacent (within 5 ft) of an enemy with a reach of 5ft.

On the druid’s turn, he reverts to humanoid form, reducing his size from large to medium and placing him out of the enemy’s reach. The druid can now move away without giving the enemy an opportunity attack.

Is this correct?

Does the bonus damage from Spirit Shroud apply to an Echo’s opportunity attacks?

The UA spell Spirit Shroud has the following effect:

Until the spell ends, any attack you make deals 1d8 extra damage when you hit a creature within 10 feet of you.

The Echo Knight has the following ability (emphasis mine):

When a creature that you can see within 5 feet of your echo moves at least 5 feet away from it, you can use your reaction to make an opportunity attack against that creature as if you were in the echo’s space.

Assuming that a creature triggers an opportunity attack from an Echo created by an Echo Knight Fighter under the effects of Spirit Shroud that is more than 10 feet away from the creature, would Spirit Shroud’s bonus damage apply to the attack?

My uncertainty stems mainly from the fact that it’s clear that normal attacks made by the Echo would not gain this bonus (if made from more than 10 feet away), as they simply originate from the Echo:

When you take the Attack action on your turn, any attack you make with that action can originate from your space or the echo’s space

The addition of "as if you were in the echo’s space" seems to imply that opportunity attacks for Echos work differently, however.

Can an Echo Knight with the War Caster feat use cantrips for opportunity attacks made by their Echo?

The Echo Knight has the following ability:

When a creature that you can see within 5 feet of your echo moves at least 5 feet away from it, you can use your reaction to make an opportunity attack against that creature as if you were in the echo’s space.

The Warcaster feat has the following benefit (emphasis mine):

When a hostile creature’s movement provokes an opportunity attack from you, you can use your reaction to cast a spell at the creature, rather than making an opportunity attack.

If an Echo Knight has the War Caster feat and knows a cantrip like, say, Booming Blade, can they use the cantrip for opportunity attacks made from the position of the Echo?

Does Tremorsense allow Attacks of Opportunity

Can a monster with tremorsense that is blinded make attacks of opportunity when an enemy leaves its reach?

Tremorsense is described as:

A monster with tremorsense can detect and pinpoint the origin of vibrations within a specific radius, provided that the monster and the source of the vibrations are in contact with the same ground or substance.
Tremorsense can’t be used to detect flying or incorporeal creatures. Many burrowing creatures, such as ankhegs, have this special sense.

There is a Sage Advice ruling on blind opportunity attacks that specifically mentions blindsight but does not mention tremorsense

An opportunity attack is triggered by “a hostile creature you can see”. If you can’t see an enemy, you can’t make an opportunity attack against it.
Creatures with blindsight are an exception to this rule, because that ability lets those creatures “see” within a certain radius.

As long as the target is touching the ground does tremorsense essentially work the same as blindsight?